Perhaps you should try some spelling variations:
manh trung » manh tung, thanh trung, manh hung
hieu sach » chieu sach, hieu cach, dien sach
trung cap » truong cao, trung tam
dang cong » dung cong
hieu cac » hieu luc, hieu va, hieu van
cap dang » cao dang, cac dang, cap bang
tan than » tan thanh, tan tran, tam than
ban than » ban thanh, van thanh, ban hang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sach) or (hieu cac)) - manh trung cap dang cong ((tan than) OR (ban than)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sach) OR (hieu cac)) - manh trung cap dang cong ((tan than) OR (ban than)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu sach) or (hieu cac)) - manh trung cap dang cong ((tan than) OR (ban than)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sach) or (hieu cac)) - manh trung cap dang cong ((tan than) OR (ban than)) cao*.